Sid's one of the smartest guys in the league. I wouldn't be surprised if he memorized all the protocols, and knows how he needs to act to pass them, even if he is not healthy.
That would be scary. Depres of Anaheim hid his symptoms and he missed almost the entire season this year. And he's only going to be 27 this year.
Every player has to decide what's more important to them.
Is it continue playing or do they think about the 50 years that they have after hockey. Sid can always get in touch with Savard, Pronger, Clowe, Franzen, Primeau etc. and talk to them about their experiences with PCS. How it impacts their daily lives.
Financially, Sid has made a lot of money. Around $10 million from his ELC. $43 million from his last contract. Has made $47 million so far on his current deal. Upwards of around $100 million USD. Plus what he has made in endorsements over his 12 year career. He still has $58 million or so left on his contract with the Pens.
But, what good is millions of dollars if you are not able to enjoy it?